Add workaround for skin shaders.

This solves #168, which was introduced as side-effect of 4312e6f.

src/renderer/tr_image.cpp

@@ -3027,7 +3027,7 @@ qhandle_t RE_RegisterIndividualSkin( const char *name , qhandle_t hSkin)
 		else
 		{
 		*/
-			surf->shader = R_FindShader( token, lightmapsNone, stylesDefault, qtrue );
+			surf->shader = R_FindShader( token, lightmapsNone, stylesDefault, qtrue, qfalse, qtrue );
 		/*
 		}
 		*/

src/renderer/tr_local.h

@@ -493,6 +493,7 @@ Ghoul2 Insert End
 	qboolean hasGlow;
 
 	qboolean isAdvancedRemap;
+	qboolean isSkinShader;
 
 	struct shader_s *remappedShader;                  // current shader this one is remapped too
 	struct shader_s *remappedShaderAdvanced;          // current shader from the advanced remaps this one is remapped to
@@ -1460,7 +1461,7 @@ qhandle_t		 RE_RegisterShader( const char *name );
 qhandle_t		 RE_RegisterShaderNoMip( const char *name );
 qhandle_t RE_RegisterShaderFromImage(const char *name, int *lightmapIndex, byte *styles, image_t *image, qboolean mipRawImage);
 
-shader_t	*R_FindShader( const char *name, const int *lightmapIndex, const byte *styles, qboolean mipRawImage, qboolean isAdvancedRemap = qfalse );
+shader_t	*R_FindShader( const char *name, const int *lightmapIndex, const byte *styles, qboolean mipRawImage, qboolean isAdvancedRemap = qfalse, qboolean isSkinShader = qfalse );
 shader_t	*R_FindAdvancedRemapShader( const char *name, const int *lightmapIndex, const byte *styles, qboolean mipRawImage );
 shader_t	*R_GetShaderByHandle( qhandle_t hShader );
 // shader_t	*R_GetShaderByState( int index, int *cycleTime );

src/renderer/tr_shade.cpp

@@ -322,7 +322,7 @@ to overflow.
 void RB_BeginSurface( shader_t *shader, int fogNum ) {
 
 	shader_t *state = (shader->remappedShaderAdvanced ? shader->remappedShaderAdvanced : (shader->remappedShader ? shader->remappedShader : shader));
-	if ( state->defaultShader ) state = tr.defaultShader;
+	if ( !state->isSkinShader && state->defaultShader ) state = tr.defaultShader;
 
 	tess.numIndexes = 0;
 	tess.numVertexes = 0;

src/renderer/tr_shader.cpp

@@ -3524,7 +3524,7 @@ most world construction surfaces.
 
 ===============
 */
-shader_t *R_FindShader( const char *name, const int *lightmapIndex, const byte *styles, qboolean mipRawImage, qboolean isAdvancedRemap )
+shader_t *R_FindShader( const char *name, const int *lightmapIndex, const byte *styles, qboolean mipRawImage, qboolean isAdvancedRemap, qboolean isSkinShader )
 {
 	char		strippedName[MAX_QPATH];
 	char		fileName[MAX_QPATH];
@@ -3633,6 +3633,10 @@ shader_t *R_FindShader( const char *name, const int *lightmapIndex, const byte *
 		ri.Printf( PRINT_DEVELOPER, "Couldn't find image for shader %s\n", name );
 		shader.defaultShader = qtrue;
 		//return FinishShader();
+		if ( isSkinShader ) {
+			shader.isSkinShader = qtrue;
+			return FinishShader();
+		}
 		image = tr.defaultImage;
 	}